/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.swing;
import javax.swing.event.*;
import java.io.
Serializable;
import java.util.
EventListener;
/**
* A generic implementation of SingleSelectionModel.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @author Dave Moore
*/
public class
DefaultSingleSelectionModel implements
SingleSelectionModel,
Serializable {
/* Only one ModelChangeEvent is needed per model instance since the
* event's only (read-only) state is the source property. The source
* of events generated here is always "this".
*/
protected transient
ChangeEvent changeEvent = null;
/** The collection of registered listeners */
protected
EventListenerList listenerList = new
EventListenerList();
private int
index = -1;
// implements javax.swing.SingleSelectionModel
public int
getSelectedIndex() {
return
index;
}
// implements javax.swing.SingleSelectionModel
public void
setSelectedIndex(int
index) {
if (this.
index !=
index) {
this.
index =
index;
fireStateChanged();
}
}
// implements javax.swing.SingleSelectionModel
public void
clearSelection() {
setSelectedIndex(-1);
}
// implements javax.swing.SingleSelectionModel
public boolean
isSelected() {
boolean
ret = false;
if (
getSelectedIndex() != -1) {
ret = true;
}
return
ret;
}
/**
* Adds a <code>ChangeListener</code> to the button.
*/
public void
addChangeListener(
ChangeListener l) {
listenerList.
add(
ChangeListener.class,
l);
}
/**
* Removes a <code>ChangeListener</code> from the button.
*/
public void
removeChangeListener(
ChangeListener l) {
listenerList.
remove(
ChangeListener.class,
l);
}
/**
* Returns an array of all the change listeners
* registered on this <code>DefaultSingleSelectionModel</code>.
*
* @return all of this model's <code>ChangeListener</code>s
* or an empty
* array if no change listeners are currently registered
*
* @see #addChangeListener
* @see #removeChangeListener
*
* @since 1.4
*/
public
ChangeListener[]
getChangeListeners() {
return
listenerList.
getListeners(
ChangeListener.class);
}
/**
* Notifies all listeners that have registered interest for
* notification on this event type. The event instance
* is created lazily.
* @see EventListenerList
*/
protected void
fireStateChanged() {
// Guaranteed to return a non-null array
Object[]
listeners =
listenerList.
getListenerList();
// Process the listeners last to first, notifying
// those that are interested in this event
for (int
i =
listeners.length-2;
i>=0;
i-=2) {
if (
listeners[
i]==
ChangeListener.class) {
// Lazily create the event:
if (
changeEvent == null)
changeEvent = new
ChangeEvent(this);
((
ChangeListener)
listeners[
i+1]).
stateChanged(
changeEvent);
}
}
}
/**
* Returns an array of all the objects currently registered as
* <code><em>Foo</em>Listener</code>s
* upon this model.
* <code><em>Foo</em>Listener</code>s
* are registered using the <code>add<em>Foo</em>Listener</code> method.
* <p>
* You can specify the <code>listenerType</code> argument
* with a class literal, such as <code><em>Foo</em>Listener.class</code>.
* For example, you can query a <code>DefaultSingleSelectionModel</code>
* instance <code>m</code>
* for its change listeners
* with the following code:
*
* <pre>ChangeListener[] cls = (ChangeListener[])(m.getListeners(ChangeListener.class));</pre>
*
* If no such listeners exist,
* this method returns an empty array.
*
* @param listenerType the type of listeners requested;
* this parameter should specify an interface
* that descends from <code>java.util.EventListener</code>
* @return an array of all objects registered as
* <code><em>Foo</em>Listener</code>s
* on this model,
* or an empty array if no such
* listeners have been added
* @exception ClassCastException if <code>listenerType</code> doesn't
* specify a class or interface that implements
* <code>java.util.EventListener</code>
*
* @see #getChangeListeners
*
* @since 1.3
*/
public <T extends
EventListener> T[]
getListeners(
Class<T>
listenerType) {
return
listenerList.
getListeners(
listenerType);
}
}